Stop mechanism for knitting-machines



2 Sheets-Sheet 1.

(No Model.)

M. O. YARWOOD.

STOP MECHANISM FOR KNITTING MACHINES.

Patented Aug. '14, 1888;

v 5 fiT R Hill!!! 4 0'. ATW

IHIIll m, washingmn, 04 a 2 sheets sheet 2.

(No Model.)

- M. 0. YARWOOD.

STOP MECHANISM FOR KNITTING MACHINES.

Patented Aug. 14, 1888.

N. PETERS. mzbum n han Washiflgkm, ma

TATES PATENT tries.

STOP MECHANISM FOR KNITTING=MACHINES.

SPECIFICATION forming part of Letters Patent No. 387,672, dated August 14, 1888. Application filed December 22, 1887. Serial No. 258,606. (No model.)

To all whom it may concern:

Be it known that I, MATTHEW O. YARWOOD, of Fall River, in the county of Bristol, State of Massachusetts, have invented a certain new and useful Improvement in Stop Mechanism for Knitting-llfachines, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of thisspecification, in which--- Figure 1 is a side elevation of a circularknitting machine provided with my improvement, certain portions not deemed essential in illustrating the invention being omitted; Fig. 2, an enlarged side elevation of the shipping mechanism; Fig. 3, an enlarged side elevation of the presser mechanism, and Fig. 4 a view showing certain details of construction.

Like letters and figures of reference indicate corresponding parts in the different figures of the drawings.

My invention relates more especially to means for stopping the machine and removing the presser from the needles when a thread breaks; and it consists in certain novel features, as hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective device for this purpose than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation.

In the drawings, A represents the table, B the legs, and G the cylinder, of the machine, these parts being all of the ordinary form and construction, excepting as hereinafter specified.

A vertically-arranged standard, 1), carrying a bracket, F, is mounted on the table A at one side of the cylinder 0, and fitted to slide horizontally therein is a shaft, E, carrying a presser-finger, f, of the ordinary construction at its inner end, which finger may be replaced by a wheel of the usual description, if preferred.

A coiled spring, I), is disposed on the shaft E, one end of which abuts against the inner face of the bracket F and the other against a fixed collet, d, on said shaft, said spring acting expansively to force the shaft outward and withdraw the presser J from the needles 9 in the cylinder 0, thereby permitting the barbs of said needles to open and prevent the loops of yarn from escaping from the shanks of the needles, as hereinafter described.

Pivoted to the horizontal portion of the bracket F there is a vertically-arranged bar, G, which rests against a laterally-projecting stud, h, on the collet cl, and pivoted to the vertical portion of said bracket there is a horizontally-arranged trencher-bar, H, provided with a stop, *5, to prevent it from falling too low when released.

Secured to the table A, below the bracket F, there is a platform, I, provided with a vertically-arranged standard, k, and fitted to work vertically on said standard there is a rod, 12, provided at its upper'end with a horizontallyarranged arm, m, which overlaps the outer or free end of the trencher-bar H.

Disposed on the platform I there is a magnet, J, which is connected with the negative pole of the ordinary galvanic battery N by the conducting-wire p, and secured to the bar 12, above said magnet, there is an armature, L.

The bar H is provided with a shoulder or catch, q, adapted to engage and hold the bar G, and the shaft E is screw-threaded at its outer end and provided with a nut, r, and check-nut 1'', which serve to regulate the extent of movement of the shaft and to adjust it into the proper position for contact with the needles when thrown forward.

A vertically-arranged standard, K, is secured to the table A at one side of the cylinder 0, and pivoted to the upper portion of said standard there is a trencher-bar, M, provided with a notch or catch, 2.

A vertically-arranged lever, O, is pivoted near its lower end to the standard K, the upper end of said bar being adapted to engage the catch 2 on the bar M, and its lower end provided with a laterally-projecting pin, w.

A vertically-arranged lever, P, is also pivoted to, the standard K, the upper end of said the pin w rests.

A bracket, Q, is secured to the table A opposite and below the standard K, and fitted to work on said bracket there is a verticallyarra-nged rod, 25, carrying an arm, 26, at its upper end,which is adapted to engage the outer or free end of the trencher-bar M, and at its lower end an armature, 27. Suspended from the bracket Q, over the armature 27, there is a magnet, Y, which is connected with the magnet J by a conducting-wire, p.

Pivoted in a bracket, 28, to the frame-work of the machine there is an ordinary shippinglever, 29, provided with a fork, 30, which stands astride a belt, 31, leading from the fast driving-pulley 32 to the pulley 33 on the coun ter-shaft 34. This lever is provided with the usual fixed arm, 35, which swings with said lever and is adapted to engage the lower end of the bar P, as shown.

A coiled spring, 37, has one of its ends secured to the frame-work of the machine and the other to the fork of the shipping-lever 29, said spring acting contractively to swing the shipping-lever inward and keep the arm 35 in forcible contact with the levers P, when said lever is set in a vertical position, as shown in Fig. 2.

A horizontallyarranged metallic bar, 40, is secured to the frame-work of the machine, said bar being electrically insulated by rubber or glass bearings 41, and mounted on said bar there are a series of drop-boxes, 1t, corresponding in number with the num ber of threads or yarns 42 being used in the machine.

The drop-boxes consist, respectively, of a metallic case, 44, (see Fig. 4,) which is provided with an elongated slot, 45, in one of its sides, and is secured to the bar by a clamp, 46.

A block of wood, 47, is secured within the case 44, and mounted on said block there is a metallic standard, 48, provided with a metallie arm, 49, which projects outwardly through the slot 45.

Pivoted horizontally in the upper end of the standard 48 there is a metallic lever, 50, which also passes through the slot in the case 44, said lever being provided at its outer end with a crescent-shaped drop-weight, 51, and onits inner arm with a counterbalance, 52.

The weight 51 is provided with a curved groove, 53, on its outer face, through which the thread 42 runs on its way from the bobbins S to the needles in the cylinder 0, said thread passing through a guide hole or eye, 54, in the bar 40 at a point nearer the case 44 than the weight 51 is located, in order to enable said weight to bear constantly on said thread, the curved formation of the groove increasing the bearing-surface of the thread therein, and consequently the friction between the thread and weight, thereby keeping the lever out of contact with the spring when the thread is unbroken.

A metallic spring, 65, is secured to the inner side of the case 44, and so arranged that when the weight 51 is dropped by the breaking of the thread 42 the inner end of the lever 50, on which said weight is mounted, will be brought into contact with said spring.

A conducting-wire, 1;, leading from the magnet Y, is connected with each of the drop-boxes R by branch conducting-wires 1), attached to the arms 49, and there is a conducting-wire, 7 5, connecting the bar 40 with the positive pole of the battery N.

In the use of my improvement, the machine is threaded up by carrying the threads 42 through the eyes 54 in the bar 40, thence through the grooves 53 in the weights 51, and thence through other suitable guides to the needles. The shaft E is then drawn forward until the prcsser f closes the barbs of the needles g, in which position it is secured by eugaging the bar G with the catch q on the bar H, the armatureL being supported in a raised position by placing the arm m of the rod 1; on the outer end of the bar H, as shown in Fig. 3. The machine is now started up by shipping the belt 31 from the loose pulley onto the fast pulley 32, the arm 35 on the shipping-lever 29 being left pressing against the lower end of the lever P, and the lovers 0 P secured in a vertical position by engaging the upper end of the lever O with the catch 2 on the lever M, as best seen in Fig. 2. The machine having been started, as described, the tension on the threads will raise the weights 51 and the outer ends of the levers 50, thereby removing their inner ends from the springs 65 and keeping the electrical circuit open; but if new one of the threads 42 breaks, its weight 51 will drop, causing the inner end of the lever 50 to be brought into contact with the springs 65 and the circuit to be closed. When the circuit is closed, the magnet Y, acting on the armature 27, will instantly raise the arm 26 on the rod 25, thereby disengaging the bar M and lovers 0 and l? and permitting the spring 37 to ship the belt onto the loose pulley 85 and stop the machine in a manner that will be readily understood by all conversant with such matters without a more explicit description. At the same time the magnet J, acting on the armature L, will disengage the bars G and H and permit the spring b on the shaft E to instantly withdraw the presser f from the needles 1 thereby allowing the barbs of said needles to open and prevent the escape of the loops from the shanks of the needles.

From the foregoing it will be obvious that the magnets being in circuit and their imme' diately-connected mechanism operated by electicity, the stoppage of the machine and withdrawal of the presser from the needles will occur simultaneously, thereby preventing the usual injury which occurs to the work by the breakage of threads.

For convenience of reference, the cylinder 0 and needles 1 are denominated the knittingmachine proper.

Having thus explained my invention, what I claim is-- 1. The drop-box It, consisting, essentially IIC of the case 44, provided with thespring 65, the vided with the catch q, the pivoted bar G,

standard 48, mounted on the insulating-block adapted to engage said catch, the sliding rod 47 and provided with the arm 49, and the le- 12, carrying the arm 1n, and armature L, the

ver 50, provided with the weight 51, having magnet J, battery N, and electrical conductors I 5 5 a thread-groove, 53, and counter-balance 52, for connecting said magnet and battery, subcombined and arranged to operate substanstantially as described.

t-ial] y as set forth.

I v 2. The sliding shaft E, mounted on the stand- MATTHEW YARWOOD' ard D, and provided With the presser f at one Witnesses: 10 end and with adjusting-nuts at the other end, JOSEPH H. BURON,

spring I), and collet d, the pivoted bar H, pro- HUGO A. DUBUQUE. 

